<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/params' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品列表</el-breadcrumb-item>
      <el-breadcrumb-item>参数管理</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 头部警告区 -->
      <el-alert
        show-icon
        title="注意: 只允许第三级分类设置相关参数"
        type="warning"
        :closable="false"
      >
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类: </span>
          <!-- 选择商品分类的商品选择框 -->
          <el-cascader
            expand-trigger="hover"
            :options="catelist"
            :props="cascadeProps"
            @change="parentCateChanged"
            v-model="selectKeys"
            clearable
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            size="mini"
            type="primary"
            :disabled="isBtnDisable"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            size="mini"
            type="primary"
            :disabled="isBtnDisable"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加参数对话框 -->
      <el-form
        :model="addForm"
        status-icon
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input> </el-form-item
      ></el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      catelist: [],
      //   指定级联选择器的配置对象
      cascadeProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children"
      },
      // 选中的父级分类的id数据
      selectKeys: [],
      // 被激活的页签的名称
      activeName: "many",
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ""
      },
      // 添加表单的数据验证对象
      addFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" }
        ]
      }
      // 控制按钮与文本框的切换显示
      // inputVisible: false,
      // 文本框中输入的内容
      // inputValue: ""
    }
  },
  methods: {
    //   获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get("categories")
      if (res.meta.status !== 200) {
        this.$message.error("获取商品列表失败")
      }
      this.catelist = res.data
      console.log(this.catelist)
    },
    // 选择项发生变化触发这个函数
    parentCateChanged() {
      this.getParamsData()
    },
    // tab 页签点击事件的处理函数
    handleClick() {
      console.log(this.activeName)
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      // console.log(this.selectKeys)
      // 选中的不是三级分类
      if (this.selectKeys.length !== 3) {
        this.selectKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 选中的是三级分类
      console.log(this.selectKeys)
      // 根据所选分类的id,和当前所处的面板,获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName }
        }
      )

      if (res.meta.status !== 200) {
        return this.$message.error("获取参数列表失败")
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ""
      })
      console.log(res.data)
      if (this.activeName === "many") {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        )

        if (res.meta.status !== 201) {
          return this.$message.error("添加参数失败！")
        }
        this.$message.success("添加参数成功!")
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 根据id删除对应的参数项目
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning"
        }
      ).catch(err => err)

      // 用户取消了删除的操作
      if (confirmResult !== "confirm") {
        return this.$message.info("已取消删除！")
      }

      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      )

      if (res.meta.status !== 200) {
        return this.$message.error("删除参数失败!")
      }

      this.$message.success("删除参数成功!")
      this.getParamsData()
    },
    // 文本框失去焦点，或按下了enter键都会触发
    handleInputConfirm(row) {
      // console.log("ok")
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ""
        row.inputVisible = false
        return
      }
      // 如果没有 return 则证明输入的内容，需要做后续的处理
      // console.log(row.inputValue)
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ""
      row.inputVisible = false

      this.saveAttrVals(row)
    },
    // 将对 attr_vals 的操作保存到数据库
    async saveAttrVals(row) {
      // 需要发起请求保存这次操作
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(" ")
        }
      )

      if (res.meta.status !== 200) {
        return this.$message.error("修改参数项失败！")
      }
      this.$message.success("修改参数项成功！")
    },
    // 点击按钮，展示输入文本框
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  created() {
    this.getCateList()
  },
  computed: {
    //   按钮禁用
    isBtnDisable() {
      if (this.selectKeys.length !== 3) {
        return true
      } else {
        return false
      }
    },
    // 当前选中的三级分类的 Id
    cateId() {
      if (this.selectKeys.length == 3) {
        return this.selectKeys[2]
      } else {
        return null
      }
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === "many") {
        return "动态参数"
      }
      return "静态属性"
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0px;
}
.el-tag {
  margin: 5px;
}
.input-new-tag {
  width: 120px;
}
</style>
